/*
 *  inputbox.c -- implements the input box
 *
 *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
 *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include "dialog.h"

char dialog_input_result[MAX_LEN + 1];

/*
 *  Print the termination buttons
 */
static void print_buttons(WINDOW *dialog, int height, int width, int selected) {
    int x = width / 2 - 11;
    int y = height - 2;

    print_button(dialog, gettext("  Ok  "), y, x, selected == 0);
    print_button(dialog, gettext(" Help "), y, x + 14, selected == 1);

    wmove(dialog, y, x + 1 + 14 * selected);
    wrefresh(dialog);
}

/*
 * Display a dialog box for inputing a string
 */
int dialog_inputbox(const char *title, const char *prompt, int height, int width, const char *init) {
    int i, x, y, box_y, box_x, box_width;
    int input_x = 0, scroll = 0, key = 0, button = -1;
    char *instr = dialog_input_result;
    WINDOW *dialog;

    if (!init)
        instr[0] = '\0';
    else
        strcpy(instr, init);

do_resize:
    if (getmaxy(stdscr) <= (height - 2)) return -ERRDISPLAYTOOSMALL;
    if (getmaxx(stdscr) <= (width - 2)) return -ERRDISPLAYTOOSMALL;

    /* center dialog box on screen */
    x = (COLS - width) / 2;
    y = (LINES - height) / 2;

    draw_shadow(stdscr, y, x, height, width);

    dialog = newwin(height, width, y, x);
    keypad(dialog, TRUE);

    draw_box(dialog, 0, 0, height, width, dlg.dialog.atr, dlg.border.atr);
    wattrset(dialog, dlg.border.atr);
    mvwaddch(dialog, height - 3, 0, ACS_LTEE);
    for (i = 0; i < width - 2; i++) waddch(dialog, ACS_HLINE);
    wattrset(dialog, dlg.dialog.atr);
    waddch(dialog, ACS_RTEE);

    print_title(dialog, title, width);

    wattrset(dialog, dlg.dialog.atr);
    print_autowrap(dialog, prompt, width - 2, 1, 3);

    /* Draw the input field box */
    box_width = width - 6;
    getyx(dialog, y, x);
    box_y = y + 2;
    box_x = (width - box_width) / 2;
    draw_box(dialog, y + 1, box_x - 1, 3, box_width + 2, dlg.dialog.atr, dlg.border.atr);

    print_buttons(dialog, height, width, 0);

    /* Set up the initial value */
    wmove(dialog, box_y, box_x);
    wattrset(dialog, dlg.inputbox.atr);

    input_x = strlen(instr);

    if (input_x >= box_width) {
        scroll = input_x - box_width + 1;
        input_x = box_width - 1;
        for (i = 0; i < box_width - 1; i++) waddch(dialog, instr[scroll + i]);
    } else {
        waddstr(dialog, instr);
    }

    wmove(dialog, box_y, box_x + input_x);

    wrefresh(dialog);

    while (key != KEY_ESC) {
        key = wgetch(dialog);

        if (button == -1) { /* Input box selected */
            switch (key) {
                case TAB:
                case KEY_UP:
                case KEY_DOWN:
                    break;
                case KEY_LEFT:
                    continue;
                case KEY_RIGHT:
                    continue;
                case KEY_BACKSPACE:
                case 127:
                    if (input_x || scroll) {
                        wattrset(dialog, dlg.inputbox.atr);
                        if (!input_x) {
                            scroll = scroll < box_width - 1 ? 0 : scroll - (box_width - 1);
                            wmove(dialog, box_y, box_x);
                            for (i = 0; i < box_width; i++) waddch(dialog, instr[scroll + input_x + i] ? instr[scroll + input_x + i] : ' ');
                            input_x = strlen(instr) - scroll;
                        } else
                            input_x--;
                        instr[scroll + input_x] = '\0';
                        mvwaddch(dialog, box_y, input_x + box_x, ' ');
                        wmove(dialog, box_y, input_x + box_x);
                        wrefresh(dialog);
                    }
                    continue;
                default:
                    if (key < 0x100 && isprint(key)) {
                        if (scroll + input_x < MAX_LEN) {
                            wattrset(dialog, dlg.inputbox.atr);
                            instr[scroll + input_x] = key;
                            instr[scroll + input_x + 1] = '\0';
                            if (input_x == box_width - 1) {
                                scroll++;
                                wmove(dialog, box_y, box_x);
                                for (i = 0; i < box_width - 1; i++) waddch(dialog, instr[scroll + i]);
                            } else {
                                wmove(dialog, box_y, input_x++ + box_x);
                                waddch(dialog, key);
                            }
                            wrefresh(dialog);
                        } else
                            flash(); /* Alarm user about overflow */
                        continue;
                    }
            }
        }
        switch (key) {
            case 'O':
            case 'o':
                delwin(dialog);
                return 0;
            case 'H':
            case 'h':
                delwin(dialog);
                return 1;
            case KEY_UP:
            case KEY_LEFT:
                switch (button) {
                    case -1:
                        button = 1; /* Indicates "Cancel" button is selected */
                        print_buttons(dialog, height, width, 1);
                        break;
                    case 0:
                        button = -1; /* Indicates input box is selected */
                        print_buttons(dialog, height, width, 0);
                        wmove(dialog, box_y, box_x + input_x);
                        wrefresh(dialog);
                        break;
                    case 1:
                        button = 0; /* Indicates "OK" button is selected */
                        print_buttons(dialog, height, width, 0);
                        break;
                }
                break;
            case TAB:
            case KEY_DOWN:
            case KEY_RIGHT:
                switch (button) {
                    case -1:
                        button = 0; /* Indicates "OK" button is selected */
                        print_buttons(dialog, height, width, 0);
                        break;
                    case 0:
                        button = 1; /* Indicates "Cancel" button is selected */
                        print_buttons(dialog, height, width, 1);
                        break;
                    case 1:
                        button = -1; /* Indicates input box is selected */
                        print_buttons(dialog, height, width, 0);
                        wmove(dialog, box_y, box_x + input_x);
                        wrefresh(dialog);
                        break;
                }
                break;
            case ' ':
            case '\n':
                delwin(dialog);
                return (button == -1 ? 0 : button);
            case 'X':
            case 'x':
                key = KEY_ESC;
                break;
            case KEY_ESC:
                key = on_key_esc(dialog);
                break;
            case KEY_RESIZE:
                delwin(dialog);
                on_key_resize();
                goto do_resize;
        }
    }

    delwin(dialog);
    return KEY_ESC; /* ESC pressed */
}
